Lifting Plate at 830°C

AndreaAndrea
I'm working on a strange case: a plate is welded to a heavy shaft (6,2t) and it is submitted to a quencing cycle with the shaft.
So the shaft must be lifted at 830°C after the heating cycle (about 12 hours).
I would perform contact analysis between hook and plate hole considering the plate material elastic-plastic and hook material elastic (room temperature parameters)
Some ideas about contact parameters? Elastic modulud of structural steel at 830°C decreases until 17000 MPa.

Thanks

Comments

  • AndreaAndrea
    Plate-hook assembly
  • SergioSergio
    edited July 2017
    I'm working in a similar problem, a table to support some assemblies that will be under thermal release stress treatment at 730 degrees. One thing that could be a problem is also creep, at high temperatures could be significant. We are constrained as the furnace can't support a lot of load, so we must make a light structure.

    About contact parameters, maybe you should try with the similar values as for normal temperature, and maybe decrease a little as the stiffness of the structure and E has decreased also. The more higher the contact parameters will need more iterations but less penetration on the model. Also if you add friction would be a help to the solver.

    Yesterday I worked with a rubber bumper with insanne contacts and play a little with those values, will try to upload some pictures later.

    Best regards
  • SergioSergio
    By the way the creep will be present if the hook is stressed at temperature for long time, in your case maybe would be outside of the furnace so won´t be affected.
  • AndreaAndrea
    During heating cycle the plate is unladed. The lifting cycle is short (5 10 min) so I exclude creep. Hook is a commercial component by Crosby and it doesn't undergoes heating cycle.
    Euronorm give a 33 MPa Yiled stress for S355 at 830°C
  • AndreaAndrea
    edited October 2017
    Today the lifting of 6,2t shaft at 830°C without problems
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